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.257, 6.5mm and 270 Allen Mags, New Family or Rounds...

 
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  #8  
Old 10-30-2004, 11:25 PM
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Location: France
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Re: .257, 6.5mm and 270 Allen Mags, New Family or Rounds...

120 gr of powder in caliber smaller than 338 cal or you get poor efficiency ( ratio between muzlle velocity and powder mass )
Some ignition problem as example case in 408 with 50 bmg primer work fine with full load , with regular mag primer size as 215 Federal ignition is not perfect in al case ( cold weather very slow powder ..)
some carbon fouling problem too .

High BC bullet is alway intresting if they are accurate , what process they use or plan to use regular copper jacket and lead core or other way ?

good shooting

DAN TEC

good shooting
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  #9  
Old 11-01-2004, 08:15 AM
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Re: .257, 6.5mm and 270 Allen Mags, New Family or Rounds...

MOA,

The brass for the AM rounds is designed of a factory parent case which is very easy to get.

It will also be easy to form.

I will be offereing formed brass which will only need to be fireformed and they will be ready to go.

I will be selling the formed brass for around $25.00 to $30.00 per 50 cases.

The AM round were designed to use the common standard belted magnum bolt face so that there would not be any expensive modifications needed.

To open your standard '06 bolt face up and install a Sako extraactor would be no problem at all.

The 257 AM will also be able to be squeezed into a standard length action with an oal shortened to 3.400" compared to the original design length of 3.600".

This would certainly take up a small amount of case volume but it would still be the fastest 257 around and it would still out perform the 257 STW by at least 100 fps and out of a standard action.

This was one design aspact I wanted in the 25 version of the AM rounds. The 6.5mm AM could also be fitted into a standard length action for use with the conventional hunting bullet weights such as the 120 gr Ballistic Tip and up to the 140 class flat base hunting bullets.

The long nosed match, VLD or ULD bullets will need a long action if a repeating rifle is desired.

Good Shooting!!!

Kirby Allen(50)
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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  #10  
Old 11-01-2004, 11:40 AM
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Join Date: Oct 2004
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Posts: 62
Re: .257, 6.5mm and 270 Allen Mags, New Family or Rounds...

Fiftydriver I have been looking at building a hot 6.5 based on the STW case. If you have more powder capacity than the STW case, your round may be the way to go. When do you think you will be tooled up to start building the 6.5's. I have a 7 mag model 700 donor action in the safe as we speak. Will you be supplying dies and what is the parent case.
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  #11  
Old 11-01-2004, 01:19 PM
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Re: .257, 6.5mm and 270 Allen Mags, New Family or Rounds...

Kirby, sounds like your wildcat is a smidge bigger then the Dakota line so my guess is that this will be built around the 338 RUM case. A very nice case indeed.

Most of your projections are based on a 30" barrel. Will there be much increase, over standard volume magnums, if only using a 24 to 26" barrel as most walkabout rifles carry?

Been looking at the 25 and 6.5 WSM wildcats and they seem to be doing well in 24" to 26" barrels. Your projects are certainly higher but a 9lb 30" barreled rifle would be a feat to make and carry.

Love to hear more about your venture. We can never have too many wildcats.

Jerry
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  #12  
Old 11-01-2004, 01:36 PM
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Re: .257, 6.5mm and 270 Allen Mags, New Family or Rounds...

Your listed speeds are very impressive for the .277 which I have fine tuned over the years. Your getting a good 150+ fps over what my 270 Ackley Improved can do with my 29 inch mag target barrel.

I've considered a larger case capacity. I use IMR 7828 (65.8 and 64.6 gr) with CCI250 primers in the 140 & 150 gr. This is max load with primer pressure signs @ 70 or so degrees. The most acurrate loads are actually down about 2 grains and about 50 fps less on a 15 foot distance chronograph. So it's right at 3300 for the 150's

H1000 really would require more case capacity than a 270 AI. Because the 7828 has to use a tall drop tube and the winchester brass is full to the top and both of these are highly compressed loads.


Once you get these wildcat bullets developed I would like info on them. [img]images/icons/grin.gif[/img]

[ 11-01-2004: Message edited by: budlight ]
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.270 Ackley improved 29 inch 1.250 dia. target barrel 7mm STW 28 inch 1.250 target barrel. I also love my .458 mag for varmints and the biggest game in the world.
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  #13  
Old 11-01-2004, 05:48 PM
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Re: .257, 6.5mm and 270 Allen Mags, New Family or Rounds...

To all,

Since I know I am dealing with a very educated group of shooters and hunters here who I hold the highest respect for I knew it would not be long before someone figured out my parent case.

Yes I am building on a 338 RUM case as the platform for this round. It will be extensively modified but left the same length so brass will not be a problem nor will it be very expensive.

As far as dies go, I am working with Redding as we speak. Once the reamer is made for the 257 AM and I can get some fire formed brass I will send them off to Redding and get a batch of dies made.

Because of the demand for the 6.5mm AM it will be second to be developed as soon after the 257 as I possibly can, in fact I may order the reamer here in the next week or two.

Then the 270 will follow that.

I will respond to your individual questions when I get back from chasing whitetails tonight or in the morning.

Good Shooting!!!

Kirby Allen(50)
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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  #14  
Old 11-02-2004, 08:38 AM
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Re: .257, 6.5mm and 270 Allen Mags, New Family or Rounds...

Remingtonman25_06,

The 257 AM would probably easliy reach the velocity goals you are looking at.

After testing the 257 STW with 100 gr bullets extensively, while they can be made to work well, they are finicky as hell and often the velocity E.S. are not the best, still they are plenty for big game hunting.

My current 257 STW will drive the 100 gr Wildcat Bonded Core FBHP to a solid 4000 fps and this bullet has a B.C. in the .480 range if you can believe it. Sighted +2" at 100 yards then land 6.5" low at 450 yards, thats pretty damn flat shooting.

The problem with my AM rounds is that they will be even pissier with the light 100 gr bullets. The good thing is that the 115 gr pills should be able to be driven out of the AM just as fast as the 100 gr pills are out of the STW.

Like the STW though, the AM will really settle down with bullets of 130 and heavier. The STW turns into a pussy cat with the 130 gr bullet weight with velocity E.S. in the low teens.

This bullet has a B.C. of around .550 at 3500 fps and the AM will drive it to at least 3600 fps and I am expecting +3650 fps.

I personally do not like the 100 gr Swift A-Frame or the 100 gr XLC or TSX. In these rounds the Swift is just to sticky and will limit velocity to that of a 115 gr conventional bullet. The Barnes bullets are just to damn sensitive to pressure problems and in these cases, you really need to keep them off the lands by at least 0.050".

That said, I have two customers using the 115 gr TSX in rifles I have built that are 3/8" rifles.

On game performance with these two bullets is great but for my money, the Wildcat Bullets are a better, more accurate bullet at a lower price.

Plus, I am a heavy, long, high B.C. bullet kind of guy.

Good Shooting!!

Kirby Allen(50)
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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